Valve for gas-pumps.



No. 866,832.- TTENTBT SEPT. 24, 1907.

' 11. WHITAKBR.'

VALVE TOR GAS PUMPS. APPLICATION FILED JAN. 5|

MHBLTs-SHEBTT. Y

Witnesses IWL-866,832.

PATENTED SEPT. 24, 19o?.

R. WHITAKER. VALVE FOR GAS PUMPS. APPLIOATION FILED JAN. s. 1905.

A 2 SHEETS-SHEET 2.

Witnesses In Ven tot f A totneys.

Bronnen wnrriiirnn, or New nnnnswion4 New JERSEY, Assren'oit, B'r menor AND Mnsnn restaurateurs, 'ro snnriswiori nnrmenairnvo ooMrANY, A CORPORATION or NEW Specication of Letters Patent.

,Patented Sept. 24, 1967.,

Original application iiled January 1l, 1905i, Serial llo. 188,612. Divided and this sp1-.lisation filed January 5,1905.

' Serial No.239,72ll,

This invention relates to improvements in valves for pumps used, in compressing gas, such as ammonia gas il) in icemalring machines, and is a division of an applica4 nourris-rl by sie tammy nth, i904, seri-si No. 188,612.

' v lheobfiect .l have in view is the production of a valve which 7 the balanced type and double, that is to hsay, theoutlet valve being oi larger size and carrying l Witliinit the inlet valve, ports being provided to ad.

mit the compressed gasto both sides of the outletvalve, it will be balanced and the actuating spring Will not have to be excessively. powerful. Another object lis the production ofafvalve which may be very accessible7 0 andunay be readilytaken apart. 1 attain these objects by the mechanism illustrated in the accompanying drawings, in Which-. y

Figure l is a vertical section or' a portion of a pump similar to that disclosed in my original application :5 above referred to, andshowingthe valve in section; and Fig. 2 a sectional view thereotaken on the line 2-2 oi Fig.- 1, and Fig. 3 is a detail view.

ln all oi the views like parts are designated by the same reference characters. y V yil() In the drawingsfthe cylinder 1 is shown provided With an integrally formed Water jacket 2 and a ground upper face 3. Upon the upper face 3 is a valve support or guide 4 ha ving a ground upper face upon which rests a valve cap or crown 5. Secured to the upper part of the cap is an inlet pipe 6 which serves asameansor admitting gas to the cap. These parts are firmly secured together and to the cylinder casing by means oi a tie bar 7 which surrounds the' gas inlet pipe 6 and through which pass two or more tie bolts,l 7, their lower l0 ends being firmly secured to the casing 7b and their up- 'per extremities being provided with nuts 7, so that tension may be imparted. to the tie bolts and Ithe tie bar may be drawn down to the cap 5, the valve guide 4 and cylinder 1 allbeing firmly locked in place as described in my original application. The tie bar 7 resting upon the center ofthe cap 5 which is spherically shaped as shown, admits oi tight joints being secured at all points, even il one oi the nuts be set up tighter than the other. Ry removing the nuts and tie bar, parts which constitutethe upper portion oi the pump may be separated and the valve reached for examination or repair.

The valve is balanced and duplex. .That is fto say,

it is balanced against pressure and is double, the outlet valve carrying the inlet valve Within it. The outlet valve 8 is provided with a hollow rod 9, which works 55 within the valve guide 4, a, tight joint being secured by means oi the ringslf) and gland 11. Above the valve 8 is an equilibrium chamber 12, in which gesunder cylluder pressure is admitted through the'ports 13 (see Fig. 2), the valve guide l serving as a cover plate lor the 60 chamber and constituting one o Aits walls. A. spiral spring 14 is used to seat the valve. The gas at cylinder pressure' being admitted to the chamber 12 when the valve 8 is raised by thepressure of the gas in the cylinder on tlie'prcssure stroke o the piston, will exert a 65 downward pressure on the valve to assist the action of the spring 14, such pressure being' determined bythe difference in area between the lower and upper faces oi the valve. This difference oi area may m propor- 4 tioned byvarying the diameter' oithe hollow rod 9 of A70 the valve.

The hollow rod of the outlet valve is of small size relatively to the size of the seat with which the outlet valve engages, so thatthe area oi surface of the outlet valve within the equilibrium chamber subjected to 75. pressure in the direction which tends to seat the valve Will'be large relatively to the area oi surface within the Acylinder tending to unseat the valve.

The' inlet valve 15 is oi the shape shown, and engages with a seat formed upon the valve 8. The inlet valve is provided with a long stem 16, which passes through the hollow rod 9 of the valve 8. The stem 16V is hollow and communicates with the chamber 17', which in turn communicates with the gos inlet pipe 6. A free passage for the entering gas through the valve 15 is secured .85 by means of the small lateral openings 18, which communicate with the annular passage 19 above the valve seat. The inlet valve is held upon its seat by means of a spiral spring 20, which rests upon a shoulder 2l,

formed within the hollow rod 9 oi the valve 8. The 9()v vof the piston, the valve 151 is opened by the iii-rushing' gas, and upon the ascent oi the piston the gas is compressed between the piston and the two valves. Upon the pressure within the cylinder exceeding that ol the spring 14', the outlet valve will open sulliciently against the tension of the spring to permit the gas undercylinder is compressed to' such a degree that the downward pressure upon the outlet valve within the equilibrium chamber added to the tension of the spring 14, is insu'fii:A

cient to sea-t the valve, the latter will remain unseated, consequently `upon the downward stroke oi the piston,

.no gas will-,be drawn in 'through the inlet valve. 'lhis is ior the reason thatthe inlet valve cannot open until the outlet valve is seated, and the `piston has descended far enough to produce a sufficient 'rateiication of gas within the cylinder to cause anopening oi the inlet valve against the tension of itsciosing spring. This will be understood from the following explanation The inlet valve cannot open unless the outlet valve is irst seated, and the piston has descended sufficiently to cause. the inlet valve to open and permit the entrance of gas to the cylinder. So long as the pressure within the equilibrium chamber and cylinder Aexceeds a certain amount, the outlet valve will remain unseated, the descent of the piston not reducing the pressuresuiiiciently to permit the outlet valve to seat, and vthe-inlet valve to open, and admit fresh gas. i The device acts as a safety valve, and prevents excessive pressure with- ".n the cylinder, equilibrium chamber and passages within which the compressed gas is carried. After reaching the point where the outlet valve remains unseated, no fresh gas will be admlitted and the pressure will remain constant. The degree of pressure produced by the device may be varied by changing the strength of the spring 14, and increasing or diminishing the size ol the hollow rod 9 of the outlet valve. The smaller the hollow rod is, the greater will be the area of pressure within the equilibrium chamberot the outlet valve, tending to seat the valve, consequently with given pressure a weaker spring 14 may be employed. vThis arrangement by means of which the inlet valve is carried by means oi the pressure valve, permits a compar-x ativcly large size of equilibrium surface of the pressure valve, thereby allowing oi a weaker seating spring. By mounting the inlet valve in the pressure valve, and passing the latter through an opening which is guarded by means of a gland and rings, as described, a very simple and inexpensive type of packing is produced, such packing being analogous to shaft packing, as distinguished from piston packing, which cannot be set up with a gland. v

Having now described my invention, what l claim as new and desire to secure by Letters Patent is:

1. In a iiuid compressor, the combination with a valve casing \vlrich contains a valve seat, andan equilibrium chamber. ot" a duplex valve comprising an outlet valve and an inlet valve carried thereby, the outlet valve h nving a stem part of hollow rod form, which passes through a wall of the equilibrium chamber', the exterior' diameter' of such stem part being well wit-hin the diameter of the outlet valve, the bore oi the stem part constituting the inlet passage for the gas, and bei-ng substantially coincident with the center of the valve. 5

2. In a iluld compressor, the combination witha valve casing which contains a valve seat andan equilibrium chamber', of a duplex valve comprising an outlet valve and an inlet Vvalve carried thereby, the outlet valve having a stem part of hollow-rod form which passes through a Wall of the equilibrium chamber', the stem of the inlet valve being in line with a portion of the bore ofthe stem part of the outlet valve, the exterior diameter' of such stem part being Well within the diameter' of the outlet valve, and the bore of the stem part constituting the inlet passage for' the gas.

3. In a iiuid compressor, the combination with a valve casing which contains a valve seat, and an equilibrium chairmen-of a duplex valve comprising an outlet valve and an inlet valve carriedthereby, the outlet valve having a stem part/of hollowrod form which passes through a wall of the equilibrium chamber, the exterior diameter' of such stem part being well within the diameter of the outlet valve, the bore of the `stem 'part constituting the inlet passage for' the gas, and n seating spring within the equilibrium chamber' and surrounding the stem of the outle valve,

4. In a fluid compressor', the combination with a valve 'casing which. contains i valve seat and an equilibrium chamber, of a duplex valve comprising an outlet valve and an inlet valve carried thereby, the outlet valve having a stem part of hollow-rod form which passes through a wall of the equilibrium chamber, and the outlet valve ilt- -tlng the walls of the equilibrium chamber', there belngla draw-oli? passage in the face of the valve and`adjacent to the seat thereof.

5. In a fluid compressor, the combination with a valve casing which contains 'a -valve seat and an equilibrium chamber, of a duplex valve comprising an outlet valve and an inlet valve carried thereby, the outlet valve having a stern part of hollowa'od for-rn which passes through a wall of the equilibrium chamber' and having a central bore -which constitutes an inlet passage for the gas, rod packing and a gland surrounding the rod at the place where it passes through the walls of the equilibrium chamber'.

6. In a iuid compressor, the combination with a valve casing, which contains a valve seat and an equilibrium chamber, of a duplex valve comprising an outlet valve and and an inlet valve carried thereby, the outlet valve having a hollow rod which extends through an opening in alw'all oi the equilibrium chamber', the bore of the rod being ceuA trally arranged and' constituting the gas inlet passage, the inlet valve having a stem part which is in line with the bore, and extends outside of the equilibrium chamber', and a spring for' closing the inlet valve, and means outsidof the chamber' for adjusting the tension of the spring.

7. In a fluid compressor', the combination with an openended cylinder' having a valve seat intermediate the ends, a cover-plate for inclosing the ond of the cylinder. and a duplex valve having a hollow rod passing through the 'cover-plate, and a seating spring surrounding` the rod, the bore of the rod constituting the gas inlet passage, and beingr centrally arranged, the Suid valve depending from the cover-plate and extending into the cylinder so that the valve may be removed with the cover-plate.

'lhis specification signed and witnessed this 27th day oi' December, 1904.

RICHARD WIII'IAKER.

Witnesses Grao. F. McCormick, FRANK E. llrsrrun. 

